Razor-blade.



T. C. SHEEHAN.

RAZOR BLADE.

APPLICATION FILED OCT-4.1917.

M/l/MITOW THQMAS G. SHZEEHAN, F UPPER MONTCLAIR, NEW JERSEY, ASSIGNUF, 1'0 DURHAM DUPLEX FQMQH. COMPANY, @F NEW YORK, N. K, A CORPORATIQN 01?? NEW YORK.

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messes.

specification of Letters Patent.

Patented Inlay 2t,'fblld.

Application filed Qctober t, 1917. Serial tl'o. leaflet.

To all whom it may concern."

Be it known that I, THoMAs G. SHnnnrAN, a citizen of the United States, residing at Upper Montclair, county of Essex, and State of New Jersey, have invented a new and useful Improvement in .lEtazonBlades, of which the following is a specification.

This invention relates to an improvement in razor blades, particularly of the type used in safety razors. The invention consists in certain constructions which will be hereinafter fully described and then specitil fically pointed out in the claims hereunto appended.

' In the accompanying drawings, which form a part of this specification and in. which like characters of reference indicate the same or like parts, Figure 1' is a plan view of a blade constructed in accordance with the invention; Fig. 2 is an end view of the structure shown in Fig. 1; Fig. 3 isa plan view of a modification of the structure shown in Fig. 1, adapted for use in a diiferent type of blade holder; and Fig. 4 is a modified form of the structure shown in Fig. 1.

In carrying the invention into efi'ect, there is provided a razor blade comprising two sections each having a cutting outer edge and an inner edge interlocked with'the inner edge of the other section, the principal advantage of this construction lying in the possibility of substituting a perfect half blade for one that has been accidentally inj ured, without discarding a whole blade. In the best constructions, each of the sections has a hard outer cutting edge and a soft inner edge, and the junction line of the two sections is substantially on the median line of the blade.

Referring to Fig. l of the drawings, 8 and 7 indicate two like blade sections, the section 6 having a hard cut-ting edge 8, and the section 7 having a hard cutting edge 9. The blade as a whole is provided with an elongated slot 10, used for the purpose of positioning it on a suitable blade holder. The parting line of the-two blade sections 6 and the blade, as clearly shown in Fig. l. The section 6 has a dovetailed lug ll closely fitting a dovetailed slot 12 in the section marked 7. Similarly, the blade section 7 has a dovetailed lug l3 snugly fitting a dovetailed slot It in the blade section 6.

is substantially on the median line of The temper is drawn from the lugs 11 and 13, so that they are soft and easily. fitted respectively to the slots 12 and 14. By an inspection of Figs. 1 and 2, it will be readily understood that the interlocking of the two blade sections is eflected by a transverse relative movement of the two sections, and that therefore they are transversely interlocked, and when in interlocked position they lie in the same plane.

In the modification shown in Fig. 3, the two blade sections 15 and 16 are respectively provided with dovetailed lugs 17 and 18, similar in all respects to those in the device shown in Figs. 1 and 2. In place of the elongated holding slot shown in Fig. l, the device of Fig. 3 has three round holes 19 by means of which it is positioned on a suitable holder;

In the modification illustrated in Fig. 4, the blade sections 20 and 21 are respectively provided with lugs 22 and 23, and with lugs 24: and 25 arranged to interlock," as clearly shown.

When the interlocking lugs are soft, a blade of either type shown may be used either in a holder having a fiatsupporting member for the blade and a-flat holding member, or in a holder provided with curved supporting and holding members.

cut projection snugly fitting a correspond-- ing recess in the inner edge of the other section. I

2. A. razor blade comprising two sections each having a hard cutting outer edge and. a soft inner edge and each provided with an undercut projection snugly fitting a corresponding recess in the inner edge of the other section.

3. A. razor blade comprising two sections each having a cutting outer edge and an It'll til In the latter case, the blade may be given inner edge and each provided with an undercut projection snugly fitting a corresponding recess in the inner edge of the other section substantially on the median line of the blade.

4:- A razor blade comprising two sections each having a. cutting outer edge and an inner edge and each provided with a dove-' tailed projection snugly fitting a corre-.

sponding recess in the inner edge of the other section.

5. A razor blade comprising two sections each having a cutting outer edge and an inner edge and each provided with an undercut projection transversely engaging a corresponding recess in the inner edge of the other section.

6. A razor blade comprising two sections lying in the same planes and each having a cutting outer edge and an inner edge and each provided with an undercut projection snugly fitting a corresponding recess in the inner edge of the other section.

In testimony whereof, I have signed my name to this specification.

THOMAS C. SHEEHAN. 

